Support serialisation of Maps

[Jak2k]

Clear and concise description of the problem

Maps and Sets are not serialized.

Suggested solution

This should be solvable by passing a replacer to JSON.stringify.

Alternative

No response

Additional context

No response

Validations

• [x] Follow our Code of Conduct
• [x] Read the Contributing Guide.
• [x] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.